Prince George and Princess Charlotte were a picture of cuteness as the royal siblings arrived at the Lindo Wing at St Mary's Hospital with dad William.

The trio arrived to cheers as they made their way up the famous steps to visit their new baby brother, echoing the time when George went to greet his newborn sister in May 2015.

The Duchess of Cambridge delivered her third child on Monday 23 April, 2018 at 11.01 am, weighing 8lbs, 7oz.

George, 4, appeared to have come straight from school, wearing his Thomas's Battersea navy blue and red uniform, while Charlotte, 2, wore a £43 blue periwinkle smocked dress from Little Alice London with a dark cardigan.

Cute! (Image: Rex)

Prince George came from school to meet his new brother (Image: WENN)

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The pair waved at the gathering crowds, while holding their father's hands.

Princess Charlotte has made history after the arrival of her little brother, as she is now the first female royal to retain her claim to the throne and not be bumped down the line by the arrival of a new male.

Princess Charlotte gives an enthusiastic wave (Image: Getty)

Princess Charlotte wore a printed blue dress (Image: DAILY MIRROR)

The Succession to the Crown Act 2013 means that birth order will determine who is next in line to the throne, instead of gender.

We're expecting to see George and Charlotte in public again for their Uncle Prince Harry and Meghan Markle 's wedding on May 19. They're likely to be in the bridal party as a page boy and flower girl, after almost stealing the limelight at their Auntie Pippa's wedding last year.